Save modified image as kra file

I’d like to have krita saving imported jpg or other picture files as default *.kra files,
krita detects multiple layers of whatever type in the frontmost document. The original image file (e. G. jpg, png, tif) would be untouched and the changes transferred to the new file (the *.kra file)
… To the user the choice, where to safe the file (I’d like a predefined path to save my *.kra files but that’s another story)

I often do a paint over or photo bashing of imported images

Just click on “also save as .kra” in the export settings dialog.